[gme-users] Too many passes while parsing XML file error

[James Edmondson]

As a followup to this, I can't seem to replicate this problem with a
simple metamodel in GME 11.3.23. I constructed a metamodel which
allows for a Model A to contain both references to Model A and objects
of Model A, and attempted the following model derivations:

1.) A model B of type A which contains a reference R to model B
2.) A model B of type A which contains a subtype S of model B
3.) A model B of type A which contains an instance I of model B
4.) A model B of type A which contains a copy C of model B

Neither of these seemed to go through the 100 passes. To download the
paradigm I created and the XME files I have exported, you can look
here:
http://sites.google.com/site/distributedreasoner/Cycles_Attempts.zip

Either GME can only have this problem in larger models, or I am
missing something. Any thoughts on how I can replicate this issue?

Thanks,
James


On Wed, Jun 29, 2011 at 10:11 AM, James Edmondson <jedmondson at gmail.com> wrote:
> Hi Kevin,
>
> I would think that a good debug message could be constructed using a
> coloring scheme or by keeping a list of generated models so far in the
> importation process and having a simple check for cycles in the XME
> structure that looks at the previously concretized models from the XME
> source. I'm not sure if this is a common bug with model developers or
> not, but if it is, a cycle detection algorithm in the XME import would
> be very useful, I would think, in tracking down the culprit and
> constructing detailed debugging information.
>
> Cycle and deadlock detection have a lot of attached literature. Does
> anyone already have a deadlock detection interpreter for GME that
> might be modified to look for this in an XME file (before it is
> imported). This might help James Hill find the cycle in his client's
> large XME model. He probably doesn't have the MGA file, so this is
> sort of like finding a needle in an XML haystack. Does anyone have
> experience in looking for these cycles in XME files so we all might
> know specifically what to look for when this happens in our own
> models?
>
> Thanks,
> James
>
>
>
> On Wed, Jun 29, 2011 at 9:41 AM, Kevin Smyth <ksmyth at isis.vanderbilt.edu> wrote:
>> Yes, this only happens when there is a circular reference. For example,
>> if you have a subtype, then move the archetype into the subtype, there
>> is a circular reference. Or if a set has a reference member that
>> references the set. Or a simple circular reference chain.
>>
>> Unfortunately, due to the design of the xme parser, the only way to
>> determine what is happening is with a debugger.
>>
>> Kevin
>>
>> -----Original Message-----
>> From: gme-users-bounces at list.isis.vanderbilt.edu
>> [mailto:gme-users-bounces at list.isis.vanderbilt.edu] On Behalf Of James
>> H. Hill
>> Sent: Tuesday, June 28, 2011 4:08 PM
>> To: gme-users
>> Subject: Re: [gme-users] Too many passes while parsing XML file error
>>
>> Hi James,
>>
>> On Jun 28, 2011, at 4:52 PM, James Edmondson wrote:
>>
>>> Hi James,
>>>
>>> Do you have a link to the XME available for download?
>>
>> First, let me check with sponsors before attaching the model. ;-)
>>
>>> The only thing I
>>> can think of is a circular ref of a recursive model.
>>
>>> Is that something
>>> that is possible with your paradigm?
>>
>>> Like a model ref to itself within
>>> the model?
>>>
>>>
>>
>> That could be possible. It would be great if GME would report why it is
>> going though 100+ phases in the parsing. I have never seen it go over 3,
>> even for large models. :-)
>>
>> Thanks,
>>
>> James
>>
>>> Thanks,
>>> James
>>>
>>>
>>> On Tue, Jun 28, 2011 at 12:39 PM, James H. Hill <hillj at cs.iupui.edu>
>>> wrote:
>>>> Hi,
>>>>
>>>> I have a model that when I try to import it, goes through at least
>>>> 100+ passes before displaying the following error message:
>>>>
>>>>   Too many passes while parsing the XML file.
>>>>
>>>> Has anyone experienced this problem?! If so, how did you resolve this
>>
>>>> problem? This is the first time I have encountered this problem, and
>>>> the .xme files in only 181 KB, which is small compared to others that
>>
>>>> I am able to successfully import.
>>>>
>>>> Thanks,
>>>>
>>>> James
>>>>
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